Hm...well, it looks like your assets aren't all the same/similar resolution (the ESRB rating and Bungie logo are hi-rez, but I see jpeg artifacts on the XBOX header); your composition's also a little confusing (the Marathon insignia's blocking the view of the Security Officer).

I would suggest removing the insignia and nudging down the artwork so that the logo isn't blocking the SO, either. Alternatively, you could find the original Mac box art and arrange the XBOX stuff over that, and see how that looks.